Cutter head for woodworking machines



F. SCHIMMEL.

CUTTER HEAD FOR WOODWORKING MACHINES.

APPLICATION FILED MAY SI, 1921.

Patented Oct. 24, 1922.

Patented Get. 2%, 1%22.

race.

FRIDOIQIN SCHIMMEL, 0F FARIBAULE, EUNE@TA.

CUTTER E 18.5. I FQE WOQDWORKING' MACHINES.

Application filed may 81,

To all whom it may concern:

Be it known that 1, Famous SOHIMMEL, a citizen of the United States,residing at Faribault, in the county of Rice and State of Minnesota,have invented certain new and useful Improvements in Cutter Heads forWoodworkin Machines, and I do hereby declare the folfiwing to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it a pertains to make and use thesame.

y present invention provides an improved cutter head for use inwood-workin machines such as planers and sha ers, an generally stated,the invention consists of the novel devices and combinations of deviceshereinafter described and defined in the claims.

One of the chief objects of this invention is to provide a cutter head,the cutting action of the several knives of which will be continuous orsubstantially so, thereby producing a very smooth surface free fromwaves or irre ularities. I Another object is to provide eEicient knivesthat may be made at small cost and readily applied inspiral arrangementon the cutter head and which, moreover, when applied, may be readilysharpened. These objects and others are accomplished in the cutter headillustrated in the drawings, wherein like characters indicate like partsthroughout the several views.

Referrmgto the drawings:

Fig. 1 is a plan view of the cutter head, some parts being broken away;and

Fig. 2 is a section on the line 2-2 of The body of the cutter head 3 isof substantially cylindrical form with spiral channels therein and itmay be formed integral with or driven onto a mandrel 4, but

.the former construction is illustrated in the drawings. The body ofsaid cutter head 3 is formed with spiral clamp channels or grooves 5that diverge in cross section, leaving intervening spiralribs 3 withapproximately parallel sides, which parallel sides, of course, have aspiral trend.

As an important feature, the knives 6 are thin tempered steel bladesthat are normally or naturally flat but are capable of springing andthereby fittin themselves to the slightly spiral sides of t e ribs 3,when subjected to pressure'from wed e-shaped clamping blocks 7. Theseclamping blocks 7, are so beveled that when they engage the blades 1921.Serial lilo. 473,683

6 at one side at inner and outer points marked 7, they will engage theface of the opposite rib 3' only at one point 7?, which Is at the centerof the outer edge of said block. The bearing edges '2' are preferablycut away so that they bear only near the ends of the block. This givesthe block a fourpoint bearing against the blade at one side and aone-point bearing against the rib 3* at theopposite side. Otherwisestated, the clamplng block can adapt itself to the blade and its bearing7 will then find its proper point of bearing on the opposite rib 3Screws 8, passed through perforations in the blocks 7 and screwed mtoradial seats in the head 3, serve to detachably clamp the blocks 7 inposition as stated. As these blocks are faced at suitable intervals alonthe blades they will securely hold the same, cause said blades to beclamped tightly against the spiral surfaces of the ribs 3 and to assumethe spiral form of the latter.

As is evident, the knife blades in thin normally flat form; may beeasily made at comparatively small cost, whereas, heavy kn ves wouldhave to be ground or cut to splral form and would be relatively veryexpensive. Moreover, the thin blades are capable of being easilysharpened, either before or after they are applied to the cutter head.They should be ground and sharpened while applied to the cutter head,and for this purpose, I have devised a highly efficient grinding tool,which is made the subject matter of a companion application, filed ofeven date herewith under Serial Number 4:7 3,682.

A cutter head with knives spirally applied as described will have acontinuous cutting action, in that one knife will come into actionbefore the knife just ahead of it has gone out of action, and this goesa long way towards insuring a smooth and waveless or otherwise irregularfinished surface. Moreover, the knives are given a sort of a drawingaction.

The above features, moreover, produce a cutter head that will requireless power to operate it than a cutter head wherein the knives come intoaction intermittently.

In their outer faces, the spiral flanges 3 are formed immediatelyadjacent to the cutting edges of the blades 6, with channels 9. Thesechannels 9 are formed with shoulders that extend parallel to the cuttingedges of said blades and, hence, also follow spiral courses. Thesechannels are important, first because they give clearance for thedischarge of the cut chips and, second because their shoulders affordguides for a grinding tool, which, as already stated, is made thesubject matter of a companion application, heretofore identified.

The statement made herein and in the claims that the cutter head has lonitudinal clamp channels and intervening anges is used in a broad andliberal sense to mean that they extend in a general direction from oneend toward the other of the cutter head and re ardles of whether or notthey are paralle to the axis of the cutter head or whether or not theyfollow s iral courses on the c lindrical surface of t e cutter head. Itwi 1 be noted that the clamping blocks 7 are longitudinally spaced, withrespect to each other, and the ends of the cutter head 3 to affordspaces into which may be inserted a suitable tool to engage the loweredges of the knives 6 and raise the same.

The cutter head described is especially adapted and particularlydesigned for use 1n connection with planers and other woodworkingmachines. The thin cutter blades are especially adapted for action onwood surfaces, whereas, for metal working, much heavier and difl'erentlydesigned cutting edges or blades would be required.

What I claim is:

1. A cutter head comprising an approximately cylindrical body withlongitudinal clam channels and intervening flanges, cutter bladesclamped a ainst sai flanges, and clamps a plied in said channels,adjustably connecte to said body and operative to clamp said cutterblades in working positions, said clamps having longitudinally spacedcontacts engageable with the cutter blades and also having singlecontacts located between said longitudinally spaced contacts andengageable with the flanges.

2. A cutter head comprising an approximately cylindrical bodywithlongitudinal clamp channels and intervening cutter blades clampedagainst sa1d flanges, and clamps applied in said channels, adjustablyconnected to said body and operative to clamp said cutter blades 1nworkin posi tions, said clamps having longitudinal y and radially spacedcontacts engageable with the cutter blades and also having singlecontacts located between said longitudinally and radially spacedcontacts and engageable with the flanges.

' 3. A cutter head comprising an approximately cylindrical body withlongitudinal clam channels and intervenin flanges, cutter b ades clampedagainst sai flanges, and

flanges,

contacts engageable with the cutter blades and also having sin lecontacts located between said longitu inally spaced contacts andengageable with the flanges.

4:. A cutter head comprising an approximately cylindrical body withlongitudlnal clam channels and intervenin flanges, cutter b ades clampedagainst sai flanges, and a plurality of longitudinally spaced clampsapplied to said channels, adjustably connected to said body andoperative to clamp said cutter blades in working position, said clampshaving longitudinally and radially spaced contacts engageable with thecutter blades and also having single contacts located between saidlongitudinally and radially spaced contacts and engageable with theflanges.

5. A cutter head comprising an approximately cylindrical body withlongitudinal spiral clamp channels and intervening spiral flanges,cutter blades clamped against said flanges, and a plurality oflongitudinally spaced clamps applied in said channels, adjustablyconnected to said body and operative to clamp the cutter blades inworking position, said clamps having longitudinally spaced contactsengageable with the cutter blades and also having single contactslocated between said longitudinally spaced contacts and enga eable withthe flanges.

6. A cutter hea comprising an approximately cylindrical body withlongitudinal spiral clamp channels and intervening spiral flanges,cutter blades clamped against said flanges, and a plurality oflongitudinally spaced clamps applied to said channels, adjustablyconnected to said body and opera tive to clamp said cutter blades inworking position, said clamps having longitudinally and radially s acedcontacts engageable with the cutter lades and also havin single contactslocated between said f0 tudinall and radiall spaced contacts and engageale with the anges.

7. A cutter head comprising an approximately cylindrical body withlongitudinal spiral clamp channels and intervening spiral flanges,cutter blades clamped against said flanges, and a plurality oflongitudinally spaced clamps applied in said channels, ad justablyconnected to said body and operative to clamp the cutter blades inworking position, said clamps having longitudinally spaced contactsengageable with the cutter blades and also having single contactslocated between said longitudinally spaced contacts and engageable withthe flanges,

said cutter blades being thin and normally flat and adapted to be sprungto the spiral form of the flanges agalnst which they are seated by apressure applied thereto from the clamps.

8. A cutter head comprising an approximately cylindrical body withlongitudinal ngiclam channels and intervening flanges, cutter b adesclamped against said flanges, and clamps applied in said channels,adjustably connected to said body and operative to clamp said cutterblades in working posi-.

tion, said clam s being longitudinally spaced to permit t e insertion ofa tool into the channels for engagement with the cutter blades to liftthe same.

9. A cutter head comprising an approximately cylindrical body withlongitudinal clamp, channels and intervening flanges, cutter bladesclamped against said flanges, and clamps applied in said channels, adustably connected to said body and operative to clamp said cutter bladesin working position, said clamps having longitudinally spaced contactsengageable with the cutter blades and also having single contactslocated between said longitudinally spaced contacts and engageable withthe flanges, said clamps terminating short of the ends of said channelsto permit the insertion of a tool into the channels for engagement withthe cutter blades for raisin the'same.

In testimony whereof I ax my signature.

FRIDOLIN SCHIMMEL.

